二進

二 = 一 : Mnemonic symbol: a capacitor, because the two strokes remind me of the symbol in electrical drawings. Albert Einstein (Ø) is experimenting with a capacitor (二) in the space station's bathroom (Ø4). He finds that it's uncomfortable to discharge a capacitor using two flutes (一).

进 = 井 + 辶 : Joan of Arc fell into a well after she entered the encampment's bathroom, but luckily one of her gladiator sandals got stuck on one toilet, so now she can use the string to climb out of the well.